class Background:
    def __init__(self, position_x, position_y, step):
        self.position_x = position_x
        self.position_y = position_y
        self.step = step

    def get_position(self):
        return (self.position_x, self.position_y)

    def reset_position(self):
        self.position_x = 0
        self.position_y = 0

    def left(self):
        self.position_x -= self.step

    def up(self):
        self.position_y -= self.step

    def right(self):
        self.position_x += self.step

    def down(self):
        self.position_y += self.step
